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Old 09-05-2001, 05:07 PM
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300e Check Engine Light w/Transmission in gear

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Today my car starting doing something new. When I put the car into any gear from park, the check engine light goes on. If I move it back to park it still stays on. The transmission seems to be operating as normal, but, I'm paranoid now to travel any long distances. I don't think it's a bad bulb since I didn't have the lights on. If it is not something simple I will have to bring it in to an expert MB mechanic. Where do I begin to diagnose this?

1986 300e
198,900 miles
Purchased the car two years ago.
No major repairs.
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Old 09-05-2001, 08:23 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
On this year, the only thing that will turn on the light is a malfunction of the O2 sensor. I would have this checked.
Donnie Drummonds
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Old 09-06-2001, 08:33 AM
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Join Date: Apr 2001
Location: Indianapolis
Posts: 87
I have an '88 300E and the same situation occurred with the check engine light. I replaced the Oxygen Sensor and everything was fine after that.
'88 300E
'00 Expedition
'86 Alfa Romeo Spider
'84 Harley Davidson FLH"X"
Special Edition
'70 FJ40 Land Cruiser (basket case)
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